Ship fresh water guarantee system

The invention relates to a ship fresh water guarantee system which is characterized in that the water inlet end of a fresh water generation module is connected with a seawater inlet pipe, and the water outlet end is connected with a water storage module for converting seawater into fresh water and inputting the fresh water into each water cabin of the water storage module after conditioning and disinfecting the fresh water; a water tank circulating filtering device in the water storage module is connected among the water tanks and is used for purifying fresh water in the water tanks, keeping the turbidity of the fresh water within a required range and transferring the fresh water among the water tanks; the water tank disinfection devices are connected between the water tanks and used for fresh water preservation of the water tanks, and the water outlet ends of the water tanks are connected with the water using module. The monitoring module is respectively connected with the fresh water making module, the wate